活性炭喷射耦合布袋除尘脱除燃煤烟气有机污染物

Removal of coal-fired flue gas organic matter by activated carbon injection coupled with bag filter

为了探究燃煤烟气有机物的吸附特性,以木质活性炭作为吸附剂、邻二甲苯和甲苯作为吸附质,开展了120~130℃温度下有机物质量浓度为40~50 mg/m3时活性炭喷射耦合布袋除尘器(ACI+BF)脱除燃煤有机物的试验,研究了有机物沸点、极性以及模拟烟气中水汽、燃煤飞灰和SO_(2)等组分对ACI+BF脱除有机物性能的影响.结果表明:有机物沸点是影响吸附脱除效率的主要因素,极性强弱会影响吸附速率;空气气氛下,邻二甲苯吸附脱除效率为56.68%;水汽和SO_(2)在活性炭上与有机物产生竞争吸附,吸附脱除效率分别最大下降24.94%和6.662%,水汽的影响强于SO_(2);燃煤飞灰因其对活性炭的覆盖作用,低浓度时有抑制吸附作用,吸附脱除效率下降了8.58%,但随着飞灰浓度提高,因促进滤袋上滤层的产生,抑制作用减弱,吸附脱除效率下降了1.61%;水汽、燃煤飞灰和SO_(2)三者混合组分条件下,有机物吸附脱除效率下降程度最大,吸附脱除效率仅为47.13%.

To study the removal characteristics of coal-fired flue gas organic matter,the wooden activated carbon was selected as adsorbents,while o-xylene and toluene were selected as adsorbates.The test for removal of organic matter by the activated carbon injection coupled with bag filter(ACI+BF)was carried out at 120-130℃,while the mass concentrations of organic matter was 40-50 mg/m3.The influences of the boiling point and the polarity of organic matter,the water vapor,coal-fired fly ash,and SO_(2) in simulated flue gas on the removal performance of the organic matter by ACI+BF were studied.The results show that the boiling point of the organic matters is the main factor affecting the removal efficiency,and the molecular polarity affects the adsorption capacity.Under air atmosphere,the removal efficiency of o-xylene is 56.68%.The water vapor and SO_(2) adsorb competitively with the organic matter on the activated carbon,and the removal efficiency decreases by 24.94%and 6.662%,respectively.The effect of water vapor is stronger than that of SO_(2).The low concentration of the fly ash inhibits the adsorption due to its coverage of activated carbon,and the removal efficiency decreases by 8.58%.However,when the concentration increases,the inhibition of the fly ash reduces due to the promotion of the formation of the filter layer on the filter bag,and the removal efficiency decreases by 1.61%.When the water vapor,the coal-fired fly ash and SO_(2) are mixed,the removal efficiency of organic matter decreases the most,and is only 47.13%.